ISL88731HRZ Intersil, ISL88731HRZ Datasheet - Page 10

• Manufacturer Part Number: ISL88731HRZ
• Description: IC BATT CHRGR SMBUS LVL2 28-TQFN
• Manufacturer: Intersil

Specifications of ISL88731HRZ

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 8 V ~ 26 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Short Circuit Protection and 0V Battery Charging
Since the battery charger will regulate the charge current to
the limit set by the ChargeCurrent register, it automatically
has short circuit protection and is able to provide the charge
current to wake up an extremely discharged battery.
Undervoltage trickle charge folds back current if there is a
short circuit on the output.
Undervoltage Detect and Battery Trickle Charging
If the voltage at CSON falls below 2.5V ISL88731 reduces
the charge current limit to 128mA to trickle charge the
battery. When the voltage rises above 2.7V the charge
current reverts to the programmed value in the
ChargeCurrent register.
Over Temperature Protection
If the die temp exceeds +150°C, it stops charging. Once the
die temp drops below +125°C, charging will start up again.
The System Management Bus
The System Management Bus (SMBus) is a 2-wire bus that
supports bidirectional communications. The protocol is
described briefly here. More detail is available from
www.smbus.org.
10
ISL88731
General SMBus Architecture
Data Validity
The data on the SDA line must be stable during the HIGH
period of the SCL, unless generating a START or STOP
condition. The HIGH or LOW state of the data line can only
change when the clock signal on the SCL line is LOW. Refer
to Figure 15.
SDA
SCL
CPU
SMBUS MASTER
CONTROL
CONTROL
SCL
SDA
DATA VALID
DATA LINE
STABLE
INPUT
INPUT
OUTPUT
OUTPUT
FIGURE 15. DATA VALIDITY
VDDSMB
ALLOWED
SLAVE DEVICES
CHANGE
OF DATA
TO OTHER
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT
CONTROL
CONTROL
CONTROL
CONTROL
SMBUS SLAVE
SMBUS SLAVE
SCL
SDA
SCL
SDA
February 8, 2011
REGISTERS,
REGISTERS,
MACHINE,
MACHINE,
MEMORY,
MEMORY ,
FN9258.2
STATE
STATE
ETC
ETC